#include <iostream>
#include <sstream> 
using namespace std;

int main() {
	string inputstr("Ivanov Sidor Efremovich");
	
	stringstream temp(inputstr);
	string F,I,O;
	temp>>F>>I>>O;
	string outstr=string("")+I[0]+"."+O[0]+". "+F;

	cout<<outstr;
	return 0;
}